Malicious PDF — malware analysis report

Static analysis result for SHA-256 f17b2724208cf99d…

MALICIOUS

PDF

89.2 KB Created: 2021-07-04 02:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: afb7fab05cf8d0ff1b2107279c8cfd04 SHA-1: 09e0254367ecd27a97ac71f759f03d0ff95c2776 SHA-256: f17b2724208cf99dfd9b73c6f2bc66ae6bbda6bbd7bcd1c7ab11571170483a21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests a link farm designed to obscure the ultimate destination or to leverage SEO poisoning tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://inwebjor.ru/uplcv?utm_term=power+boat+licence+cost PDF link annotation
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948fd59551c---jomusasemewun.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/gakazibufive.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210609_082338.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/jugex.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa4dbe104d---burugevijaj.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/ad2eed46f1f8b18852919ebe54bf4d3b/givigefojiwetugaso.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882131e9958---lugavarinigago.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/e6f3db8a1588ee7543fc62241d236b70/sikomorilapode.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/41829747133.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ae94358156d---32644899955.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/b1dc8054dffc83bf523438bc9c6dfb86/50610507060.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/69fcf2f3db6ec962fa497c985aba176f/40238719797.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160923fec1f674---tofasexalawefiwowodagot.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/7148816644.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cda798255---zexatemowojo.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acdb9810126---97404759044.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/jaxozijewimeniwagu.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/sujil.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e725a0224---31574275593.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/xudaxipokodelarifigi.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078fad3642d4---wuzajaxikaj.pdfIn PDF document text
    • http://ligneus.hu/upload/file/wipep.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/disogazibopowuwiwuw.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/bewukonog.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF969 10448 bytes
SHA-256: 7804958fcb7ade99bfbdf9af69974c0ec320cbb1c3d8da0431be0e53bea73153
font_01_sfnt_off0001114c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114C 17544 bytes
SHA-256: 209e83af2695f6c2a3b29d53a4276a02239788f718ba2780a3f0093d79ba2220
font_02_sfnt_off00013fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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